Hello, Dave, I'm hoping you have some good ideas for us. We have a 05 Winnebago Journey, 350 Cat. For about 5 months, we have been getting the Check Engine/Stop Engine light for short periods of time. It is typically on an uphill, though not really significant to strain the engine. It lasts from 5 to 10 seconds and then goes out. We have had it to numerous service places to read the engine codes, and there is never anything definitive. We took it to our regular service place, and they were unable to determine anything. Their advice was to just keep driving it until the lights stayed on, then someone would be able to diagnose it. The engine is not overheating; we actually had the radiator replaced in June. This did start after the radiator replacement. Any ideas? Thank you!

PJfromny, first question did a caterpillar dealer read out the ECM. Or private service shop.What you have happening is what is called an event code that comes and goes. If you hadCaterpillar ET diagnostic computer readout there is something present to start from. If yourPulling A car you could be getting a 173-0 code , or coolant level code . Without anything toGo wait till something happens. Ask Dave, Dave Atherton Retired Cat mechanic

You may be low on coolant in the expansion tank which should be about half full.....clue is the radiator replacement...likely you should check your coolant level...This is where the coolant sensor is located.

Thank you for your responses. This helps us know what conversations to have with the mechanic. We dropped it off for service today. I didn't realize there was a difference in reading the codes by a Cat dealer and a generic one.

PJfromny, you just answered your problem. Using a generic code reader versus Caterpillar ET. This answered the question as to why Cat ET did not pick up on the event codes youare having. Caterpillar ET service tool will pin point what is happening with your engine,but you will need to have a Caterpillar Service Shop read out your. Codes. Ask Dave, Dave Atherton Retired Cat Mechanic